A quick experiment shows the following error from the schema scanner:

mim_lf.exp:34148:
  --ERROR PE056: Query expression source must be an aggregate.

ENTITY styled_item
  SUBTYPE OF (representation_item);
  styles : SET [0 : ?] OF presentation_style_assignment;
  item   : styled_item_target;
WHERE
  WR1: (SIZEOF(styles) = 0) AND
       ('AP242_MANAGED_MODEL_BASED_3D_ENGINEERING_MIM_LF.STYLED_TESSELLATED_ITEM_WITH_COLOURS' IN TYPEOF(SELF)) OR
       (SIZEOF(styles) = 1) OR
       (SIZEOF(styles) > 1) AND
       (SIZEOF(QUERY(pres_style
                     <* styles
                     | NOT ('AP242_MANAGED_MODEL_BASED_3D_ENGINEERING_MIM_LF.PRESENTATION_STYLE_BY_CONTEXT' IN
                            TYPEOF(pres_style)))) =
        0);
  WR2: NOT ('AP242_MANAGED_MODEL_BASED_3D_ENGINEERING_MIM_LF.STYLED_ITEM' IN TYPEOF(item));
  WR3: ('AP242_MANAGED_MODEL_BASED_3D_ENGINEERING_MIM_LF.MAPPED_ITEM' IN TYPEOF(item)) OR
       ('AP242_MANAGED_MODEL_BASED_3D_ENGINEERING_MIM_LF.GEOMETRIC_REPRESENTATION_ITEM' IN TYPEOF(item)) OR
       (('AP242_MANAGED_MODEL_BASED_3D_ENGINEERING_MIM_LF.SET_REPRESENTATION_ITEM' IN TYPEOF(item)) AND
        (SIZEOF(QUERY(it
                      <* item
                      | NOT (('AP242_MANAGED_MODEL_BASED_3D_ENGINEERING_MIM_LF.MAPPED_ITEM' IN TYPEOF(it)) OR
                             ('AP242_MANAGED_MODEL_BASED_3D_ENGINEERING_MIM_LF.GEOMETRIC_REPRESENTATION_ITEM' IN
                              TYPEOF(it))))) =
         0));
END_ENTITY;